Join Date: May 2002
Location: Newbury Park, CA
I have a Fabspeed dual muffler. I just capped that line off.
I don't hear my wastegate opening, rather I hear the exhaust being dumped as a result of the wastegate open. If yours was stuck closed, you would overboost and your engine would shut fuel flow (at 1.3 bar, I think). If your was stuck open, you wouldn't be able to build boost.
1986 - 930 Coupe / 2016 - BMW X5 xDrive35i / 2015 - Volkswagen Golf TDI 6MT
Director of Automotive Insights at Kelley Blue Book / Forbes automotive contributor